A train 800 metres long is running at a speed of 78 km/h. If it crosses a tunnel in 1 minute, then the length of the tunnel is
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time*speed =distance or length of the tunnel.
length of the train +length of the tunnel.
length of the train +length of the tunnel.
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speed =( 78 × 5/18 )m/s = 65/3 m/s
time = 1 minute = 60 seconds
let the length of the tunnel be x meters
Then (800+x / 60)
= 65/ 3
= 3 ( 800+ x) = 3900
x = 500
time = 1 minute = 60 seconds
let the length of the tunnel be x meters
Then (800+x / 60)
= 65/ 3
= 3 ( 800+ x) = 3900
x = 500
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